Backlight for large format illumination

A method, comprising:

• assembling a four-sided frame having reflective inner surfaces, one side of the frame having a window configured to receive light from a light source;
• attaching a first reflective film to a first side of the frame;
• forming a plurality of perforations in a second reflective film;
• and
• attaching the second reflective film to a second side of the frame,
• wherein the forming comprises forming the perforations such that a field of light emanating from the plurality of perforations has a uniformity of irradiance that exceeds a threshold level.

An apparatus, comprising:

• means for assembling a four-sided frame having reflective inner surfaces, one side of the frame having a window configured to receive light from a light source;
• means for attaching a light source to the window;
• means for forming a plurality of perforations in a first reflective film;
• and
• means for attaching the first reflective film to a first side of the frame and for attaching the second reflective film to a second side of the frame,
• wherein the forming means comprises means for forming the plurality of perforations such that a field of light emanating from the plurality of perforations has a uniformity of irradiance that exceeds a threshold level.